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CVE-2021-42286

Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability

HIGH
7.8
CVSS Score
Published: November 10, 2021 at 12:47 AM UTC
Updated: August 19, 2026 at 05:18 PM UTC
9 products affected across 1 vendorWindows Server 2016Windows 10 1809Windows 10

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Severity
HIGH7.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10· Microsoft
95%
200420h221h1
Windows 10 1809· Microsoft
95%
10.0.0 ≤ v < 10.0.19041.1348
Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement
Windows Server· Microsoft
95%
20h2
Windows Server 2004· Microsoft
95%
10.0.0 ≤ v < 10.0.19041.134810.0.0
Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement
Windows Server 2016· Microsoft
95%
2004
Windows 10 2004· Microsoft
60%
10.0.0 ≤ v < 10.0.19041.134810.0.0
Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement
Windows 10 20H2· Microsoft
60%
10.0.0 ≤ v < 10.0.19042.134810.0.0
Affected range stops below 10.0.19042.1348, so it looks safe — our inference, not a vendor statement
Windows 10 21H1· Microsoft
60%
10.0.0 ≤ v < 10.0.19043.134810.0.0
Affected range stops below 10.0.19043.1348, so it looks safe — our inference, not a vendor statement
Windows Server 20H2· Microsoft
60%
10.0.0 ≤ v < 10.0.19041.134810.0.0
Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

PatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42286
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42286

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-269

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